Which is true about regression testing?

Regression testing is primarily focused on verifying that recent changes in code have not adversely affected the existing functionality of the software. Although option B states that regression tests are often performed in integration testing, it reflects a common practice within the testing lifecycle.

Integration testing often involves combining different components or modules to see how they work together, and regression testing can be a part of this phase to ensure that integrating these components hasn’t introduced any new defects or issues in already functioning parts of the system. This means running regression tests during integration testing helps to validate that the interactions between integrated components behave as expected.

Regression tests can and should be executed after various changes, not just during integration testing, to keep a system stable and functional. The nature of regression testing allows it to fit into different phases of software development and different types of testing practices, making it an integral focus throughout the software lifecycle.

Therefore, the assertion in option B makes it a true statement regarding regression testing.